Caret-position not as expected when starting to edit

[Magnus]

I've got a GridView which has AutoGenerateColumn set to true, and I don't apply any custom styles or templates, so it's pretty basic.

I've noticed that when I want to edit a cell and clicks with the mouse the caret always end up one step to the left.

 

I've tried different EditTriggers and SelectionUnits, but it doesn't change the behaviour.

 

Not a major issue, but still a bit annoying.

[Martin Ivanov]

Hello Magnus,

To alter this behavior you can subscribe to the PreparedCellForEdit event of RadGridView and manually update the CaretIndex of the TextBox that presents the cell editor. Here is an example in code:

private void RadGridView_PreparedCellForEdit(object sender, GridViewPreparingCellForEditEventArgs e)
{
    if (e.EditingEventArgs is MouseButtonEventArgs)
    {
        var textBox = (TextBox)e.EditingElement;
        textBox.CaretIndex++;
    }
}

Regards,
Martin Ivanov
Progress Telerik

[Magnus]

Thanks for your reply. I tried your suggstion earlier, but found that it didn't always work, since the caret index sometimes already were correct. This is my solution, using the actual clicked TextBlock to extract the caret index:

 

public MyRadGridView()
{
    this.PreparedCellForEdit += OnPreparedCellForEdit;
}

private int lastClickOffset;

protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
{
    var textBlock = e.OriginalSource as TextBlock;
    if (textBlock != null)
    {
        textBlock.CaptureMouse();

        var relMousePosition = e.GetPosition(textBlock);
        var textPointer = textBlock.GetPositionFromPoint(relMousePosition, true);

        lastClickOffset = -textPointer.GetOffsetToPosition(textBlock.ContentStart) - 1;
    }

    base.OnPreviewMouseLeftButtonDown(e);
}

private void OnPreparedCellForEdit(object sender, GridViewPreparingCellForEditEventArgs e)
{
    var mouseEvents = e.EditingEventArgs as MouseButtonEventArgs;
    if (mouseEvents != null)
    {
        var textBox = (TextBox)e.EditingElement;
        textBox.CaretIndex = lastClickOffset;
    }
}

[Martin Ivanov]

Hello Magnus,

I am glad to hear that you managed to achieve your requirement. And thank you for sharing your solution here.

Regards,
Martin Ivanov
Progress Telerik